Car is a 98 legacy outback in Fairbanks AK
I have been getting squishy brakes around -20F and a very hard pedal around -40F/C. I flushed all the brake lines last weekend and this only slightly helped. I did notice recently that even at -40F and letting the car warm up for 30 minutes in the parking lot that the brakes worked fine, once I got on the highway though and tried the brakes on the exit ramp the pedal was hard.
I believe that when the master cylinder is cold past -30 or the problem occurs. So I think I will try and find a way to keep the cold out from under the hood, cardboard on radiator. I would also like to plug up the fake hood air intake better than the stock black plastic thing does.
Any ideas or similar problems?